Transcript for Sony Pictures Hacked in Possible Response to the Movie 'The Interview'

A huge hack attack rocking major Hollywood studio. Sony's computer system hacked and movies leaked online. They're looking at a connection to North Korea. Cecilia Vega has the story. Reporter: North Korea isn't laughing about the latest James Franco and Seth rogen tag team. Want to go kill Kim young un? Totally. Reporter: Sit enough to prompt an all-out cyberwar? This morning, Sony pictures under attack. Launching a full-scale investigation into how they were hacked last week. Reportedly shutting down a compute system for days. The G.O.P., guardians of peace, reportedly took over Sony's internal network, threatening the release of internal data if its demands were not released. Scenes from "Annie" and "Fury" discovered online just days after the hack. That can do hundreds of millions of damage if it continues. Reporter: Sony telling ABC news overnight, the theft of its content is a criminal matter. We're working closely with law enforcement to address it. Hello, North Korea! Reporter: Sony is looking into whether North Korea is to blame. On Friday, a North Korea website called roguen's movie an evil act of provocation that deserved stern punishment. I asked the comedy duo earlier in the year, why make a movie about a tyrant? Risky move? I don't think so. It's a tough subject matter. I think the best comedies do deal with what -- on the surface, might be a tough thing to make light of. Reporter: Sounds like the stuff movies are made of. For "Good morning America," cecelilia Vega, ABC news, los Angeles. This is the biggest piracy incident since "Expendables 3" was hacked. Millions and millions and millions of dollars at risk. Let's go back to rob.

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